ascidian

ascidian

[uh-sid-ee-uhn] Zoology.
noun
1.
any solitary or colonial tunicate of the class Ascidiacea, exhibiting in the larval stage the vertebrate characteristics of a notocord and hollow nerve cord.
adjective
2.
belonging or pertaining to the class Ascidiacea.

Origin:
1855–60; < Neo-Latin Ascidi(um) a tunicate genus (see ascidium) + -an

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World English Dictionary
ascidian (əˈsɪdɪən)
 
n
1.  any minute marine invertebrate animal of the class Ascidiacea, such as the sea squirt, the adults of which are degenerate and sedentary: subphylum Tunicata (tunicates)
2.  ascidian tadpole the free-swimming larva of an ascidian, having a tadpole-like tail containing the notochord and nerve cord
 
adj
3.  of, relating to, or belonging to the Ascidiacea

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